In my experience, a RO won't keep anyone away from a person or keep them from harming them. The only thing it does is when they do, it makes it a felony rather than a misdemeanor.
I'd tell your daughter to keep a heavy baseball bat handy at home and a can of maze on her key ring or her pocket... then LET 'ER RIP!! Not to mention her cell phone with 911 on a single dial option.

Makes me so mad that people scare others like that!!
Ya know?! Just had a thought... if that woman comes to her front door again, have your daughter keep her talking, ask her to wait just a second (tell the woman she's getting dressed or something) and while she's keeping her busy, call 911.
Be, try not to worry. You're daughter is an adult and can handle herself, right?
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Psalm 119:105 Thy word is a lamp unto my feet, and a light unto my path.